Apparatus for recording and reproducing sounds or signals.



E. E. CLEMENT.

G AND REPRODUCING souwos 0R SIGNALS. APPLICATION FILED NOV. 29. 1911-.

APPARATUS FOR RECORDIN Patented Oct. 19, 1915.

2 SHEETSSHEET 1.

E. E. CLEMENT.

APPARATUS FOR RECORDING AND REPRODUCING SOUNDS 0R SIGNALS. APPLICATIONFILED Nov; 29. 1911.

1,156fi76. I v v I Patented 0ct.19, 1915.

2 SHEETSSHEET 2.

so s'ra'rns PATENT canton.

EDWARD E. CLEMENT, OFWASHINGTON, DISTRICT OF COLUMBIA.

APPARATUS FOR.RECORDING AND BEPRODUCING SOUN'DS 0B SIGNALS.

I Specification of Letters Patent.

Patented Oct. 19, 1915.

' Original application filed Novemberi, 1905, Serial No. 287,328.Divided and this application filed November as, 1911. Serial 1%.663,115.

To all whom it may concern:

Be it known that I, EnwAnoE. CLEMENT, a citizen of the United States,residing at Washington, in the District of Columbia, have inventedcertain new and useful Im pro'vements in Apparatus for Recording objectthe improvement of such means.

This application is a division of my prior application Serial No.287,328, filed November 14, 1905, in which I have claimed the method ofoperation disclosed herein.

Briefly stated the invention consists in the use of a steel disk orcylinder upon which a magnetic spiral record is traced wlth thevariations due to speech or other sound extended laterally thereon, therecorder being either a permanent magnet or an electromagnet and thereproducer, preferably,a'n electromagnet connected to a telephonereceiver.

By the use of my invention it is possible to make a uniform trace andproduce a maximum magnetic effect. The disadvantage of previousinventions along this line has been that they depend upon variations inthe magnetic strength, so that no matter how strong the electromagnetsemployed, the reproduction would beweak because it would represent onlythe variations.

My invention is illustrated in the accompanying drawings in which Figure1 is .a plan view of the device with a permanent magnet for therecorder, parts being shown in section. Fig. 2 is a side view of thesame withparts in section. Fig.

-3 is a side view of the same with an electromagnetic recorder.

Fig. 4 is a side view of the device showing the magnetic reproducer,with its circuit connections.

Referring to the drawings 1 represents a box or casing with any suitabledriving mechanism, such .as a clock train, which forming no part of myinvention, is not shown. The main arbor or driving shaft 3 of. saidmechanism projects vretically from the casingl an'd is provlded with anannular collar 4 on which a steel disk 5 i adapted to rest. The d1sk- 5is secured for rotation'by a screw-cap or thumb-nut 6 which engages theshaft 3 and presses I against the upper face of said disk 5.

. Connected to the clock train or other drivlng mechanism, so as to bedriven a partial revolution for every revolution of the shaft 3, 1s alateral screw shaft 7. The screw threaded portion of the shaft 7 engagesa bifurcated and threaded lug 8 which pro ects through a slot 2 in thetop 2 and carries the shell 9 of the recorder T provided with the usual,mouth-piece 10 and diaphragm, 11, which in this instance stands at rightangles to the disk 5. The slot 2* (Fig. 3) is provided with button-holeopenings 2, which permit ready removal of the lug 8 from engagement.with the screw shaft 7. Rigidly secured to the diaphragm 11 is apermanent magnet m having one pole 12 inengagement with the upper faceof the disk 5, and the-other pole 13 in engagement with the disk 5immediately below the pole 12, so

i that the lines of magnetism will be directed through the plate.

' In Fig. 3 I have shown an electromagnet 1i energized by a source ofcurrent X, and provided With a soft iron core 15 through which extends aflexible rod 16 of magnetic material bearing against the disk 5, andconnected to the diaphragm by a rigid rod 18.

- A frame 19 is secured to the shell 9 and supports the magnet 14 inproper relation to the disk 5. y

In the" operation of the recording device the shaft 3 is givenmotio-n inthe proper direction andv the message or signal delivered to thediaphragm 11 so as to vibrate it, thus moving the magnet back and forthover the disk, which having a rotary motion receives a magnetic trace.Therecorder being fed steadily forward by the screw 7, makes the trace aspiral.

.- For reproducing, the spiral trace may be caused to give motionmechanically .to a

light magnetic body attached to a; thin diaphragm after the manner shown1n F1gs. 1

and 2, or' an electromagnetic .reproducer'may 4 be employed as shown inFig. 4:, this means being preferredj In Fig. 4the electromagnet 20 ofthe reproducer is shown connected in circuit with the telephone receiverR. This circuit connect ion may be arranged in any well known. mannerto-produce the best a d sharpest sounds in the receiver. The polepiece'of 'field. Variouschanges may be made in the ap paratus employedwithout departing from thespirit of my invention among which I maymention the substitutionvof a cylinder for the disk, which, however,must be so arranged thatthevibrations of the recorder will be at rightangles to the direction of motion of the surface, or in other words thatthe tracer-will move back and forth along .one element of the cylinder.

In the appended claims I use the term sounding device, and I desire tohave it herein understood that by such term I intendto include anysounding devices irrespective of whether the same may be active toproduce sounds, or acted upon by sounds.

Having thus described my invention what I claim and desire to secure byLetters. Patent 1s:

1. In an apparatus for recording and reproducing speech or signals, thecombination of a'm'agnetizable'body having a magnetized trace ofsubstantially uniform in tensity and following an' undulatory pathcorresponding to sound waves, a second magnetizable body connected to asounding device, and means for subjecting said second magnetizable bodyto the action of said magnetized trace whereby the undulations of thetrace are transmitted in vibrations to the sounding device.

2. In an apparatus forrecording and reproducing speech or signals, thecombination of a magnetizable body having a magnetic trace of uniformmagnetic strength and following an undulatory path corresponding tosound waves, a magnetic device of constant magnetic strength, a soundingdevice connected with said magnetic device, and means for effectingcompound relative movement between said body and said magnetic device,whereby the magnetized part of said body will act in passing upon saidmagnetic device.

3. In an apparatus for-recording and reproducing sound, the combinationof a magnetic body having upon it a continuous magnetic trace ofsubstantially constant strength or intensity extending in a sinuouspath, a movable magnetic pole piece,'a vibrating device, connectingmeans between said pole piece and said vibrating device, together withmeans for producing compound relative motion between the magnetic bodyand the movable pole piece whereby the latter will follow the generalpath of said magnetic trace, and will be afiected by the sinuo'sitiesthereof, and will in turn produce corresponding movements of thevibrating device.

4. In an apparatus for recording and reproducing sound and signals, thecombination of a magnetic body having a continuous magnetized tracetherein of substantially constant strength or intensity extending in awavy path, a receiver magnet and diaphragm, and means forsubjecting'sai'd magnet to the action of said Wav trace of magnetism,whereby it will ten to follow said trace and thus vibrate its diaphragm.

5. In an apparatus for recordingand reproducing sound, the combination'ofa mag-.

netic body having a continuous magnetic trace thereon of substantiallyconstant strength or intensity extending in a wavy path, a magnet, adiaphragm, means for producing motion of said magnetic body and forexposing said magnet to the action of said wavy trace of magnetismduring said movement, and means for transmitting from said magnet tosaid diaphragm the waves or vibrations thus magnetically set up.

6. In an apparatus forrecording and reproducing sounds, the combinat1onof a magnetic body having upon-it a contlnuous magnetic trace ofsubstantially constant strength or intensity extending in a sinuouspath, and a reproducer comprising amagnet and a diaphragm, and meansconnecting the same, together with means for producing motion of saidmagnetic body to cause sald sinuous magnetic trace during such motion tovariably afl'ect said magnet and through the-magnet aflect saiddiaphragm, to produce sounds corresponding to the sinuosities of themagnetic trace.

In testimony whereof I afiix my signature in presence of two witnesses.

' EDWARD E. CLEMENT.

Witnesses:

' H. F. L6WENSTEIN,

C. S. GRUMMAN.

